R: Compute burt table from a factor dataframe.

burt {amap} | R Documentation

## Compute burt table from a factor dataframe.

### Description

matlogic returns for all variables a matrix of logical values for each levels. burt is defined as t(matlogic).matlogic

### Usage

    burt(x)
    matlogic(x)

### Arguments

`x` | A dataframe that contents only factors

### Author(s)

Antoine Lucas

### Examples

    color <- as.factor(c('blue','red','red','blue','red'))
    size <- as.factor(c('large','large','small','medium','large'))
    x <- data.frame(color,size)

    matlogic(x)
    ##  color.blue color.red size.large size.medium size.small
    ##1          1         0          1           0          0
    ##2          0         1          1           0          0
    ##3          0         1          0           0          1
    ##4          1         0          0           1          0
    ##5          0         1          1           0          0

    burt(x)
    ##              color.blue color.red size.large size.medium size.small
    ##  color.blue           2         0          1           1          0
    ##  color.red            0         3          2           0          1
    ##  size.large           1         2          3           0          0
    ##  size.medium          1         0          0           1          0
    ##  size.small           0         1          0           0          1

[Package amap version 0.8-18 Index]